Seismological analysis of the stars gamma Serpentis and iota Leonis: Stellar parameters and evolution

	Seismological analysis of the stars gamma Serpentis and iota Leonis: Stellar parameters and evolution
	Bi SL(毕少兰)1,2 ; Basu, S 3; Li, LH 3
刊名	ASTROPHYSICAL JOURNAL
	2008-02-01
卷号	673 期号:2 页码:1093-1105
关键词	stars : evolution stars : fundamental parameters stars : individual (gamma Serpentis = HD 142860, iota Leonis = HD 99028) stars : oscillations
ISSN号	0004-637X
通讯作者	Bi, SL (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
产权排序	第二完成单位
英文摘要	In order to assess the information that will be available from targets of the Microvariability and Oscillations of Stars (MOST) satellite, we explore the possible evolutionary status and perform preliminary seismological analysis of two targets: the stars gamma Ser and iota Leo, which show solar-like oscillations. Taking into account the astrometric observational constraints on the stars, we find that gamma Ser is in the main-sequence phase of evolution, while iota Leo has two distinct solutions that match well with observations: main-sequence models and post-main-sequence models. The evolutionary tracks cover the following ranges of mass and initial metallicity: gamma Ser, 1.15-1.20 M-circle dot and Z = 0.0135 +/- 0.003; iota Leo, 1.62-1.70 M-circle dot and Z = 0.024 +/- 0.002 (for values of the Galactic helium enrichment ratio Delta Y/Delta Z in the range 0 - 2). By combining stellar models with observational constraints, we determine age ranges of 3.2 +/- 0.6 Gyr for gamma Ser and 1.7 +/- 0.2 Gyr for iota Leo. The results show that the masses and ages of the stars are very sensitive to metallicity and evolutionary phase. Furthermore, we find that models with overshooting from a convective core predict a larger age for a given mass. Finally, we discuss future prospects for constraining stellar models with the help of asteroseismic observations.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MAIN-SEQUENCE STARS ; STANDARD SOLAR MODEL ; DEBRIS DISKS ; ETA-BOOTIS ; ABUNDANCES ; ASTEROSEISMOLOGY ; SPECTRA ; CLASSIFICATION ; OSCILLATIONS ; OPACITIES
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/673/2/1093/
语种	英语
WOS记录号	WOS:000253454300039
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5196]
专题	云南天文台_恒星物理研究组
作者单位	1.Department of Astronomy, Beijing Normal University, 100875 Beijing, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011 Yunnan, China 3.Department of Astronomy, Yale University, New Haven, CT 06520
推荐引用方式 GB/T 7714	Bi SL,Basu, S,Li, LH. Seismological analysis of the stars gamma Serpentis and iota Leonis: Stellar parameters and evolution[J]. ASTROPHYSICAL JOURNAL,2008,673(2):1093-1105.
APA	Bi SL,Basu, S,&Li, LH.(2008).Seismological analysis of the stars gamma Serpentis and iota Leonis: Stellar parameters and evolution.ASTROPHYSICAL JOURNAL,673(2),1093-1105.
MLA	Bi SL,et al."Seismological analysis of the stars gamma Serpentis and iota Leonis: Stellar parameters and evolution".ASTROPHYSICAL JOURNAL 673.2(2008):1093-1105.